Abstract: In view of importance of roof separation monitoring of mine roadway, the paper proposed a design scheme of monitoring system of roof separation. It gave structure and arrangement scheme of measured points and detailedly introduced hardware and software design of surrounding rock movement sensor which can measure displacement of roof separation. It also analyzed determination methods of position of roof separation and alarm threshold of displacement of roof separation. The actual test result showed that the system realizes real-time monitoring for displacement of roof separation with 2.5% measuring precision.